I am seventeen years old and I have had breast pain for a straight month. Ever since the beginning of my last period all the way up to now, and I started my period yesterday so I'm not pregnant. It started a little after I began seeing a new guy but it's began before we started being sexually active. So Maybe it's hormones? They feel heavy and tender mainly around the bottom and the outer sides and in some areas when I'm pressing on them there's a sharp pain. Could they be growing? I've always heard that by the time you're sixteen theyre pretty much done. Has anybody else had this same issue?